Depends, Shikamaru had a lot of focus, but the arc was really just about Konoha vs the Akatsuki, with a lot of focus being given to Naruto and his growth at that point,which is funnily enough treated as him getting closer to bringing Sasuke back, very explicitly. And as Zenzu pointed out, apperently the arc was ended earlier because his editors wanted to go back to focusing on Sasuke and his plot, which ultimately leads to a pretty major Akastuki member blowing himself because Sasuke made him that mad,lol. In comparison, I don´t see why Shikamaru would come across out of place in comparison, fighting the Akatsuki that´s attacking his own village.
Perhaps, but the obsession some characters ended up having with Sasuke was a bit too much. I think that´s pretty obvious
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The point is not what could have happened based on their power levels, it´s based on what actually happened in the story, both of them on the floor, knocked out,having lost an arm, bleeding out and needing Sakuras help. Meanwhile, Sasuke has an actual victory over Naruto. It just speaks to how Kishi views the two characters, he was never really comfortable with having Naruto get W´s over Sasuke too much, just not how he wanted to right the story, with him clearly having a bit of favoritism towards Sasuke.